| 摘要 |
PROBLEM TO BE SOLVED: To provide an impact rotary tool which can suitably shift to a retightening operation mode. SOLUTION: The impact rotary tool is formed of a driving mechanism for carrying out clamping work by an impact force generated by driving, a motor 3 as a driving source of the driving mechanism, an operation indicating main switch 2, and a control means 5 for controlling the on/off-state of the motor 3, and shiftable to the retightening operation mode. Further the impact rotary tool comprises a time period detecting section 9 for measuring an on/off-time period of the main switch 3, and the control means 5 controls the shift of the impact rotary tool to the retightening operation mode based on a time period detected by the time detecting section from the time the main switch 2 is turned off to the time the main switch 2 is turned on again. After the completion of ordinary work, if the main switch is turned on again within a predetermined time period, retightening operation is carried out. COPYRIGHT: (C)2006,JPO&NCIPI
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